228 Ordeb 13.— CKUCIFER^ 



1. NASTURTIUM, R. Br. Water Cress. (Lat. nasus tortus ; from 

 the effect of these acrimonious plants upon the nose.) Sepals equal at 

 base, spreading; siliques subterete, generally curved upwards, some- 

 times shortened so as to resemble a silicic ; valves veinless ; seeds 

 small, lens-sbaped, Co, in a double row (0 = ). — Aquatic plants with 

 pinnate or pinnatifid Ivs. 



* Petals -white. Siliques rather long (10 — 12") No. 1 



* Petals yellow. Siliques shortened (4— 8''), but longer tliati the pedicels (a). 



* Petals yellow. Siliques or eilieles (1 — 6") shorter than the pedicels (b). 



a Leaves pinnate or pinn.atilid. Diffusely branched No8. 2, 8 



a Leaves lyrate., or merely toothed. Stems erect Nos. 4, 5 



b Petals not longer than the calyx, obscure Nos. fi, 7 



b Petals longer than the calyx, bright yellow !No8. 6, 



1 W. ofBoxnale E. Br. ENausa Water Cress. Lva. pinnate, irts. ovate, sub- 

 cordate, repand; petals -white, longer than the calyx. — H Brooks and springy 

 places, rare. (Yellow Springs, 0.) St3. decumbent, thick, branching, 6 — 12' long. 

 Lfts. 3 — 7, broad, mostly rounded at base, obscurely toothed, terminal one 

 largest. Pis. coryrabed. Siliques hardly 1' long. Occasionally cultivated for 

 salad. May, Jn. § \. 



2 N. tanaoetifolium Hook. TANSET-LEiVED. Upper leaf segm. confluent, lower 

 distinct, oUong or roundish, sinuate-toothed teeth obtuse ; pods linear-oblong. — @ 

 Damp soib, Ga. and Fla., W. and N. W. to the Miss. Sts. smooth, diffusely 

 branched from the base, 4 — 12' high. Eoot Ivs. 2 — i' long, narrow, regularly 

 pinnate -with 19 — 15 segm. in the larger plants, the 3 upper segm. often conflu- 

 ent Fls. minute. Pods 4 — 8" long, shghtly curved, on ped. j as long, and 

 tipped with a distinct but short style. Mar, May. 



p. OETUStrir. Lfts. mostly distinct, oval, obtuse ; pods shorter (3 to 5"), t-wice 

 longer than pedicel (ST. obtusum, Nutt.) 



3 N. 'Walteri. Segm. of the Ivs. ail distinct, narrow, with a few linear, acute loben 

 or teeth; pods linear, — 11 1 Ga. (Feay and Pond.) and Car. Rt. thick, blackish, 

 with many strong fibres. Lvs. numerous, mostly radical or subcauline, 1 — 2' 

 long, finely dissected, the terminal segm. 3-lobed. Sts. branched from the base 

 (only?), 3 — 5' high, puberulent. Fls. minute. Pods slender, about 5" long, 



. ped. half as long ; style distinct. Mar., Apr. (Sisymbrium Walteri Ell.) 



4 W. Umosum Nutt. Lvs. lanceolate, toothed, lower ones pinnatifled at base 

 (lyrate), upper entire at base ; pods eUiptic-oblong (3 — 4").— d) Edges of the 

 Miss., La. (Hale.) Glabrous. Sts. erect, simple, branched only at top, 10 — 16' 

 high. Lvs. all cauline and petiolate, the lower irregularly divided at base, where 

 they touch the water. Eao. several. Fls. minute. Pods on very short pedicels, 

 with styles much shorter. Apr., ' May. Hardly distinct from the next. 



5 N. sessilifldruni Nutt. Lvs. cuneaie-obovate, repandly toothed or sub-entire ; 

 pods linear-oblong (5 — 6"), subsessile. — ® Banks of the Miss. Glabrous. Sts. 

 erect, nearly simple. Lvs. attenuated at base, those of the stem nearly 

 entire. Fls. minute. Eac. elongated in fruit, both pods and stigmas almost 

 sessile. Apr. — Jn. 



6 N. paluatre PC. Marsh Cress. Glabrous ; lvs. pinnately lobed, amplexical, 

 lobes confluent, dentate; rt. fusiform; .pet. as long as the sepals; silicle spreading, 

 turgid, twice longer than wide. — 2| In wet places. St. 1 — 2f high, erect, branched 

 above. Lvs. 2 — 3' long, all more or less pinnatifled, with the terminal lobe ' 

 large, ovate. Fls. numerous, small Silicle 3" long, pedicels twice as long, often 

 deflexed. Jn. — Aug. 



7 N. hispidum DO. Vilhus; lvs. runcinate-pinnatified, hies obtusely dentate; 

 silicles tumid, ovoid or globular, the pedicels longer, ascending; pet. scarcely as 

 long as the calyx. — © Banks of streams N. H. to Penn. Stem angular, branched, 

 1 — 3f high, with many paniculate racemes above. Lvs. 3 — 6' long. Fls. 

 minute. Silicles 1" long, on pedicels 2 — 3" long and somewhat spreading. Jn. 

 —Aug. 



8 K. sylvestre E. Br. Wood Chess. Lvs. pinnately divided, segm. serrate or »»- 

 cised; pods linear, style very short — 21 Wet meadows, near Philadelphia (Nutt)- 



